Copy letter from Robert William Frederick Harrison, to A E Thompson, care of Messrs Willans & Robinson, Limited, Victoria Works, Rugby 'Dear Sir, [blank space] January 3rd, and to say that the paper [On the Measurement of Temperatures in the Cylinder of a Gas Engine] by Professor [Hugh Longbourne] Callendar and [William Ernest] Dalby was published in Proceedings [of the Royal Society] No. A 535 and may be obtained of Messrs Harrison & Sons, 45 St Martin's Lane, W.C. price 3s/6d'. 6 January 1908